It is a warning which has to be written (at least in Austria: it's obligatory here) on the TV screen after commercials for drugs (well, I guess only certain drugs - your aspirin commercia you'll get without this warning, I think) and it means:
For risks and side effects please read the 'package insert'*) and ask your doctor (general practicioner) or pharmacist (druggist).

*) Unbelievably, this is what my dictionary gives for 'Packungsbeilage'; I can't quite believe it, really.
Anyway, the 'Packungsbeilage' is a description of indications, contraindications, dosage and side effects (and much, much more) which has to be included in any drug package sold here in Austria (as to wether this is obligatory elsewhere I can't be of help).

In Lithuania is usually used this more detalised slogan, but in shots is read in unreally speeded speach (per less than 2 sec.), as so no one can understand it in first time . But as You hear it thousands times, You can perectly memorize it.

In the Philippines,
English is used saying; consult physician/your doctor before using this product. and in Tagalog it is translated as " Sumangguni muna sa inyong Duktor bago gumamit ng produktong ito."

In Japan there is a thing called 薬事法 yakujihou (eng:Pharmaceutical Affairs Law), which states several warnings depending on the medicine that is being described. When these are going to display on the screen it makes a warning sound which doesn't last more than 1 second, this is likely to the industry's voluntary agreement rather than a law one.

We also have that in Israel, Hebrew, and as in Italy they say it really fast and quiet.
*Drugs are illegal here(except for medical reasons), so we have that on cigarettes instead:
משרד הבריאות מזהיר כי העישון מזיק
מחקרים מראים שהעישון מזיק\הסיכוי לחלות בסרטן גבוה בשמונים אחוזים\....ועוד
misrad habri'ut mazhir ci ha'ishun mazik [llabri'ut] - ministry of health warns that smoking damages [health].
mekhkarim mar'im sheha'ishun mezik/hasikuy lakhalot besartan gavoha beshmonim akhuzim/ etc other warnings - researches show that smoking is damaging/probability to have cancer is higher by 80%/ any other warning you can think of.

*we differ pharmacy from drugs - drugs here are strictly named for drugs as ecstasy and such. pharmacy is any kind of drug that is meant to make you healthy. we also have the exception of allowing people (who need ) to consume 'light' drugs to reduce pain(like phantom pain or w/e)

We also have that line that says in any case of taking pharmacy you should consult your family doctor[=its like a doctor whos specialized in general things]